getting duplicates with subforms and different tables

I was using this to swap out a form with subforms on it by just making
a copy and tying each to copy of the same table.

subformV1 tblVisit1
subformV2 tblVisit2
etc
    
Select Case TabCtl0.Value
    Case 0: 'Initial Visit
    Child6.SourceObject = "subformV1"
        Child6.Visible = True
        Child6.Locked = False
        Child6.Form.FilterOn = True
    Case 1: '6 Month
    Child6.SourceObject = "subformV2"
        Child6.Visible = True
        Child6.Locked = False
        Child6.Form.FilterOn = True
    Case 2: '12 Month
    Child6.SourceObject = "subformV3"
        Child6.Visible = True
        Child6.Locked = False
        Child6.Form.FilterOn = True
    Case Else
        Child6.Locked = False
    End Select

well this worked fine each subform has multible subforms but
everything on subformVx is all tied to one table.

The main form just has Id and name and its tblmain and tied to the
subforms 1 to 1 with an autoid

then we had to enter some new dates.

Main form

subform   date=====tblVisit1
	tabs with subforms
		TblVisit1

EVERYTING works fine on visit 1
BUT when you go to visit 2 enter a date and enter some data on the
subforms and try to exit I get the old "duplicate values in index"

I am thinking (I know thats scary) that the child6 blank form that I
am using has link child to master of tblmain autoid === tblvisit1
autoid
when subformV2 is replaced it is still linked to tblvisit1 and not
tblvisit2

Can this be the problem?
How can I set the linked tables correctly in this?